Pulp-screening machine.



No. 718,098; PATENTED JAN. 13, 1903.

W. H. CROSBY.

PULP SCREENING MACHINE. APPLICATION PILEDMA'R. 29,4902. N0 MODE-L. r 2SHEETS-SHEET I,

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PULP-SCREENING MACHINE.

SPECIFICATION forming part of Letters Patent No. 718,098, dated January13, 1903.

Application filed March 29. 1902. Serial No. 100,596." (No model.)

To whom it may concern:

Be it known that I, WILLIAM H. CROSBYfa resident of Water-ville, in thecounty of Kennebec and State of Maine, have invented certain new anduseful Improvements in Pulp Screening Machines; and I do hereby declarethe following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same.

My invention relates to an improved pulpscreening machine, the object ofthe invention being to provide an improved machine of this character inwhich the screening operation will be performed by a series ofoscillating levers operated by double cam-wheels to raise and permit thelowering, of diaphragms and bellows-plates, and so construct the machineas to make it practically noiseless, almost free from jar, easy running,simple and light in construction, yet strong and durable to withstandall necessary strains thereon.

With this object in view the invention consists in certain novelfeatures of construction and combinations and arrangements of parts, aswill be more fully hereinafter described, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a view in elevation,illustrating myimprovements. Figs. 2 and 3 are views in section, takenat right angles. Fig. 4 is an enlarged view illustrating a cam-wheel.Fig. 5 is a view of a lever.

1 represents a frame comprising end standards 1 and connecting bars 2and 3, and parallel cross-bars 4 connect the bars 2 and are locatedequidistant apart for a purpose which will hereinafter appear. To onebar 2 a rectangular screen -frame 5 is connected by hinges 6 and is ofthe same size as frame 1 and secured thereon in a horizontal position bymeans of hooks 7 and eyes 8, as clearly shown in Fig. 1. In thisscreen-frame 5 and supported on cross-bars 9 a slit screen 10 is securedand spaced from the lower edge of the frame, thus forming a series ofreceptacles between bars 9, screen 10, and a series of diaphragms 11, ofrubber or other suitable material, secured to the top of standards 1,bars 2, and cross-bars 4, the latter located directly beneath cross-bars9 and serve as supports therefor and divide the machine into separatereceptacles.

Below each diaphragm l1 and secured thereto is a bellows-plate 12,having downwardlyprojecting pins 13, mounted to slide in parallelguide-bars 14 and serve as guides for the bellows-plates, while aspring-metal strip 15 is secured to standards 1 and the lower edges ofcross-bars 4 and connected between said points of attachment by pins 16with the center of bellows-plates 12 to exert a downward pull thereonand hold them always against operating-levers 17, which will now bedescribed.

The levers 17 are of a general T shape, the upper cross member 18thereof pivotally supported at its ends in bars 2 and provided withcurved arms 19, hearing against bellowsplates 12, so that when thelevers are moved in one direction the arms 19 will raise bellows-plates12-and diaphragms 11, and when moved in the opposite direction springs15 will draw the bellows plates and diaphragms downward, and tooscillate the lower ends of these levers 17 I provide a series ofcamwheels 20. The drive-shaft 21 is reduced near its ends, formingshoulders, and journaled in bearings 23, secured to standards 1, theshoulders absolutely preventing longitudinal movement of the shaft, anda drivepulley 22 is secured on a protruding end of this shaft andadapted to be connected by a belt with any desired source of power. Eachcam-Wheel comprises, in effect, a cylinder having a worm-groove aroundthe same, in which a roller 2 1, carried by the lower end of lever 17,is mounted, so that as the cylinder is revolved the lever will beoscillated, and I preferably construct these cam-wheels in two sectionsadjustable by means of a screw to permit the groove to be made narrowerin the event of its becoming too large by reason of constant wear. Toreduce friction, I may inclose said cam-wheels 20 and lower ends oflevers 17. in oil-tight casings 25, supported on lower bars 3 andadapted to contain liquid lubricant for the cam-wheels.

One edge of the screen-frame 5 is provided with a series of openings 26to permit the pulp ICO to escape from the several receptacles into atrough 27, from which latter the pulp escapes through a port 29.

In operation pulp is drawn down through screen 10 by the action ofbellows-plates 12 and diaphragms 11, they being operated by levers 17,as above explained.

By constructing a pulp-machine as pointed out the vibration is extremelyslight as compared with machines of this character heretofore known, andI thereby greatly reduce the strain on the machine and the supporttherefor and am enabled to construct the machine much cheaper and yethave a more perfect working device than any heretofore constructed.

A great many slight changes and alterations might be resorted to in thegeneral form and arrangement of the several parts described withoutdeparting from the spirit and scope of my invention, and hence I wouldhave it understood that Ido not limit myself to the precise constructionset forth, but consider myself at liberty to make such slight changesand alterations as fairly fall within the spirit and scope of myinvention.

Having fully described myinvention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In a pulp-straining machine, the combination with a frame, of abellows-plate, a bellows diaphragm over said plate, a screen above thediaphragm, a lever to raise the bellows-plate and then permit it todescend, and a double cam-Wheel to oscillate said lever.

2. In a pulp-straining machine, the combination with a frame, of abellows-plate, a bellows diaphragm over the same, a screen above thediaphragm, a pivoted lever connected with said frame and adapted whenoscillated to raise said bellows plate and diaphragm, means for causingthe bellows-plate to descend, and a double cam-wheel to oscillate saidlever.

3, In a pulp-straining machine, the combination with a frame, a bellows,and a screen above the bellows, of a bellows-plate under the bellows, apivoted lever having an arm bearing against said plate, double cam foroscillatin g said lever to raise the plate and then permit it todescend, and a spring connected with the bellows-plate and operating tocause it to follow the leverin the descent of thelatter.

4. In a pulp-straining machine, the combination with a frame, of abellows-plate having guides on said frame, an approximately T-shapedleverpivotally supported at the ends of its horizontal member in theframe, arms on said horizontal member located against the lower face ofthe bellows-plate and adapted to raise the same and then permit it todescend when the vertical member of said lever is oscillated and meansfor oscillating said lever.

5. In a pulp-straining machine, the combination with aframe, ascreensupported thereon, diaphragms beneath the screen, andbellows-plates secured to said diaphragms, oscillating levers to movesaid bellows-plates, a drive-shaft, cam-wheels on said shaft havingworm-grooves therein, and rollers carried by the lower ends of saidlevers mounted in said grooves.

6. In a pulp-straining machine, the com bination with a frame, ascreen-frame hinged to said frame and supported thereon and forming aseries of receptacles below the screen, of diaphragms secured to theframe and forming the bottom of said receptacles, bellowsplates securedto said diaphragms, oscillating levers to operate the bellows-plates, adriveshaft mounted in the frame and having contracted journals toprevent longitudinal movement of the shaft, double cam-wheels on theshaft to oscillate the lower ends of the levers and lubricant-casingsinclosing the cam-' wheels and supported on the frame.

7. In a pulp-straining machine, the combination with a frame and ascreen-plate supported thereon, of diaphragms secured to the frame belowthe screen-plate, bellows-plates secured to the diaphragms, verticalpins carried by the bellows-plates, guide-bars perforated to receivesaid pins, springs to hold the bellows-plates depressed, and oscillatinglevers to raise said bellows-plates.

In testimony whereof I have signed this specification in the presence oftwo subscribing Witnesses.

WILLIAM H. CROSBY. Witnesses:

JAMES F. BUSH, HENRY A. FARWELL.

